manytomanyfield.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 1,189 行 · 第 1/3 页

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.amber.field;

import com.caucho.amber.expr.AmberExpr;
import com.caucho.amber.expr.ManyToOneExpr;
import com.caucho.amber.expr.OneToManyExpr;
import com.caucho.amber.expr.PathExpr;
import com.caucho.amber.query.QueryParser;
import com.caucho.amber.table.LinkColumns;
import com.caucho.amber.table.AmberTable;
import com.caucho.amber.type.EntityType;
import com.caucho.amber.type.AmberType;
import com.caucho.bytecode.JType;
import com.caucho.bytecode.JTypeWrapper;
import com.caucho.config.ConfigException;
import com.caucho.java.JavaWriter;
import com.caucho.util.CharBuffer;
import com.caucho.util.L10N;

import javax.persistence.CascadeType;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;

/**
 * Configuration for a bean's field
 */
public class ManyToManyField extends AssociationField {
  private static final L10N L = new L10N(ManyToManyField.class);
  private static final Logger log
    = Logger.getLogger(ManyToManyField.class.getName());

  private String _mapKey;

  private EntityType _targetType;

  private AmberTable _associationTable;

  private LinkColumns _sourceLink;
  private LinkColumns _targetLink;

  private ArrayList<String> _orderByFields;
  private ArrayList<Boolean> _orderByAscending;

  public ManyToManyField(EntityType relatedType,
                               String name,
                               CascadeType[] cascadeTypes)
    throws ConfigException
  {
    super(relatedType, name, cascadeTypes);
  }

  public ManyToManyField(EntityType relatedType,
                               String name)
    throws ConfigException
  {
    this(relatedType, name, null);
  }

  public ManyToManyField(EntityType relatedType)
  {
    super(relatedType);
  }

  public ManyToManyField(EntityType relatedType,
                               String name,
                               ManyToManyField source,
                               CascadeType[] cascadeTypes)
    throws ConfigException
  {
    super(relatedType, name, cascadeTypes);

    _targetType = source.getRelatedType();
    _associationTable = source._associationTable;
    _sourceLink = source._targetLink;
    _targetLink = source._sourceLink;
  }

  /**
   * Gets the map key.
   */
  public String getMapKey()
  {
    return _mapKey;
  }

  /**
   * Sets the map key.
   */
  public void setMapKey(String mapKey)
  {
    _mapKey = mapKey;
  }

  /**
   * Sets the target type.
   */
  @Override
  public void setType(AmberType targetType)
  {
    _targetType = (EntityType) targetType;

    super.setType(targetType);
  }

  /**
   * Returns the source type as
   * entity or mapped-superclass.
   */
  public EntityType getRelatedType()
  {
    return (EntityType) getSourceType();
  }

  /**
   * Returns the target type.
   */
  @Override
  public EntityType getTargetType()
  {
    return _targetType;
  }

  /**
   * Returns the association table
   */
  public AmberTable getAssociationTable()
  {
    return _associationTable;
  }

  /**
   * Sets the association table
   */
  public void setAssociationTable(AmberTable table)
  {
    _associationTable = table;
  }

  /**
   * Adds a column from the association table to the source side.
   */
  public void setSourceLink(LinkColumns link)
  {
    _sourceLink = link;
  }

  /**
   * Returns the source link.
   */
  public LinkColumns getSourceLink()
  {
    return _sourceLink;
  }

  /**
   * Adds a column from the association table to the target side.
   */
  public void setTargetLink(LinkColumns link)
  {
    _targetLink = link;
  }

  /**
   * Returns the target link.
   */
  public LinkColumns getTargetLink()
  {
    return _targetLink;
  }

  /**
   * Sets the order by.
   */
  public void setOrderBy(ArrayList<String> orderByFields,
                         ArrayList<Boolean> orderByAscending)
  {
    _orderByFields = orderByFields;
    _orderByAscending = orderByAscending;
  }

  /**
   * Initializes the field.
   */
  @Override
  public void init()
    throws ConfigException
  {
    // XXX: might not have cascade delete if there's an associated entity

    _targetLink.setSourceCascadeDelete(true);
    _sourceLink.setSourceCascadeDelete(true);
  }

  /**
   * Generates the set clause.
   */
  @Override
  public void generateStatementSet(JavaWriter out, String pstmt,
                          String obj, String index)
    throws IOException
  {
  }

  /**
   * Generates the select clause.
   */
  @Override
  public String generateLoadSelect(String id)
  {
    return null;
  }

  /**
   * Generates loading code after the basic fields.
   */
  @Override
  public int generatePostLoadSelect(JavaWriter out, int index)
    throws IOException
  {
    if (! isLazy()) {
      out.println(getGetterName() + "();");
    }

    return ++index;
  }

  /**
   * Creates the expression for the field.
   */
  @Override
  public AmberExpr createExpr(QueryParser parser, PathExpr parent)
  {
    return new ManyToOneExpr(new OneToManyExpr(parser, parent, _sourceLink),
                             _targetLink);
  }

  /**
   * Updates from the cached copy.
   */
  @Override
  public void generateCopyLoadObject(JavaWriter out,
                                     String dst, String src,
                                     int loadIndex)
    throws IOException
  {
    // jpa/0s2j
    if (dst.equals("item"))
      return;

    String var = "_caucho_field_" + getGetterName();

    // order matters: jpa/0s2k
    String value = var; // generateGet(src);
    out.println(generateSet(dst, value) + ";");

    out.println(generateAccessor(dst, var) + " = " + generateAccessor(src, var) + ";");

    if (! dst.equals("super")) { // || isLazy())) {
      String oThis = "((" + getRelatedType().getInstanceClassName() + ") " + dst + ")";
      out.println(generateSuperSetter(oThis, generateSuperGetter("this")) + ";");
    }
  }

  /**
   * Updates the cached copy.
   */
  @Override
  public void generateMergeFrom(JavaWriter out,
                                      String dst, String src)
    throws IOException
  {
    // jpa/0s2k
    int updateIndex = 0;
    generateCopyLoadObject(out, dst, src, updateIndex);

    out.println();

    // jpa/0i61
    generatePreCascade(out, "aConn", CascadeType.MERGE);
  }

  /**
   * Generates the target select.
   */
  @Override
  public String generateTargetSelect(String id)
  {
    return getTargetType().getId().generateSelect(id);
  }

  /**
   * Generates the select clause.
   */
  public String generateTargetLoadSelect(String id)
  {
    CharBuffer cb = CharBuffer.allocate();

    cb.append(getTargetType().getId().generateLoadSelect(id));

    String value = getTargetType().generateLoadSelect(id);

    if (cb.length() > 0 && value.length() > 0)
      cb.append(", ");

    cb.append(value);

    return cb.close();
  }

  /**
   * Generates the set property.
   */
  @Override
  public void generateGetterMethod(JavaWriter out)
    throws IOException
  {
    String var = "_caucho_field_" + getGetterName();

    boolean isSet = getJavaType().isAssignableTo(Set.class);
    boolean isMap = false;
    if (!isSet) {
      isMap = getJavaType().isAssignableTo(Map.class);
    }

    JType type = getJavaType();
    JType []paramArgs = type.getActualTypeArguments();
    JType param = paramArgs.length > 0 ? paramArgs[0] : null;
    JType param2 = paramArgs.length > 1 ? paramArgs[1] : null;

    // jpa/0l44
    String s = "protected ";

    String collectionImpl;

    if (isSet)
      collectionImpl = "com.caucho.amber.collection.SetImpl";
    else if (isMap)
      collectionImpl = "com.caucho.amber.collection.MapImpl";
    else
      collectionImpl = "com.caucho.amber.collection.CollectionImpl";

    s = s + collectionImpl;

    if (param != null) {
      s = s + '<' + param.getPrintName();
      if (isMap) {
        if (param2 != null) {
          s = s + ", " + param2.getPrintName();
        }
      }
      s = s + '>';
    }

    s = s + " " + var;

    // jpa/0i5g
    out.println("java.util.HashSet<" + getTargetType().getBeanClass().getName() + "> " + var + "_added;");

    out.println();
    out.println(s + ';');

    out.println();
    out.println("public " + getJavaTypeName() + " " + getGetterName() + "()");
    out.println("{");
    out.pushDepth();